assoc

Displays or modifies file name extension associations. If used without parameters, assoc displays a list of all the current file name extension associations.

Note

This command is only supported within CMD.EXE and is not available from PowerShell.

For examples of how to use this command, see Examples.

Syntax

assoc [<.ext>[=[<FileType>]]]

Parameters

Parameter Description
<.ext> Specifies the file name extension.
<FileType> Specifies the file type to associate with the specified file name extension.
/? Displays help at the command prompt.

Remarks

  • To remove the file type association for a file name extension, add a white space after the equal sign by pressing the SPACEBAR.
  • To view current file types that have open command strings defined, use the ftype command.
  • To redirect the output of assoc to a text file, use the > redirection operator.

Examples

To view the current file type association for the file name extension .txt, type:

assoc .txt

To remove the file type association for the file name extension .bak, type:

assoc .bak= 

Note

Be sure to add a space after the equal sign.

To view the output of assoc one screen at a time, type:

assoc | more

To send the output of assoc to the file assoc.txt, type:

assoc>assoc.txt

Additional references

Command-Line Syntax Key